10t Underwater Air Lift Bags Strong Buoyancy Reinforced Seams Easy
Operation
Description
Hongruntong Marine’s Underwater Air Lift Bags are precision-engineered buoyancy devices designed for safe and
efficient lifting, refloating, and underwater transportation of
heavy marine structures. Constructed from high-tensile, reinforced
PVC-coated polyester fabric, these lift bags deliver superior
strength, flexibility, and abrasion resistance in harsh marine
environments.
Each lift bag is equipped with over-pressure valves, stainless
steel fittings, and multi-point lifting straps to ensure balanced
buoyancy distribution. The design supports both open-bottom and
enclosed types, suitable for lifting sunken vessels, underwater
structures, and subsea pipelines. The buoyancy range covers 1 ton
to 50 tons, customizable to meet specific salvage or diving project
needs.
Case Study — Vessel Refloating in Singapore Harbor
In 2024, Hongruntong Marine collaborated with a Singapore-based
salvage contractor to refloat a 22-meter fishing vessel that had
sunk in shallow waters near Tuas Port. The operation used eight
15-ton Underwater Air Lift Bags arranged symmetrically along the hull.
Divers attached the lift bags to pre-installed lifting points, and
compressed air was carefully introduced in stages to maintain
balance and prevent sudden buoyant shifts. Within four hours, the
vessel achieved neutral buoyancy and was safely towed to the
dockyard.
Despite rough current conditions, Hongruntong’s reinforced seams
and precision pressure-control valves prevented leakage or
instability. The client highlighted the quick setup, stability, and
reusability of the equipment, which saved over 30% operational time
compared to conventional lift systems.
Specifications
| Product Name | Underwater Air Lift Bags |
| Raw Material | Top-Notch PVC Coating Fabric |
| Type | Parachute |
| Size | 500kg, 1000kg, 5000kg 10000kg,etc |
| Thickness | 0.4-1.2mm, or as request |
| Color | Yellow,Blue,Black,etc |
| Density | 0.33-0.9g/cm3 |
| Safety Factor | 7:1 |
| Accessories | Valve, Inflatable Tube, Repair Material |
| OEM | Welcome |
| Warranty | 3 Years |
Tolerances | +/- 0.03 on densities +/- 0.2 mm on thickness +/- 0 to +3mm on width +/- 0 to +3mm on length |
| Model | Lifting Capacity | Dimensions | Appr. Weight |
| Parachute | [kg] | [lbs] | [mm] | [kg] |
| HM-P01 | 200 | 441 | 800 | 5 |
| HM-P02 | 500 | 1,103 | 1,000 | 8 |
| HM-P03 | 1,000 | 2,205 | 1,300 | 11 |
| HM-P04 | 2,000 | 4,410 | 1,600 | 20 |
| HM-P05 | 4,000 | 8,820 | 2,000 | 50 |
| HM-P06 | 6,000 | 13,230 | 2,300 | 66 |
| HM-P07 | 8,000 | 17,640 | 2,500 | 75 |
| HM-P08 | 10,000 | 22,050 | 2,700 | 80 |
| HM-P09 | 15,000 | 33,075 | 3,100 | 110 |
| HM-P10 | 20,000 | 44,100 | 3,400 | 130 |
| HM-P11 | 30,000 | 66,150 | 3,900 | 170 |
| HM-P12 | 50,000 | 110,250 | 4,600 | 220 |
| HM-P13 | 70,000 | 154,350 | 5,200 | 310 |
| HM-P14 | 100,000 | 220,500 | 5,800 | 450 |
| HM-P15 | 150,000 | 330,750 | 6,600 | 660 |
| HM-P16 | 200,000 | 441,000 | 7,300 | 900 |
| *Note: Other sizes can be customized according to the requirements. |
Features
High Tensile Reinforced Fabric
The lift bags are constructed from heavy-duty PVC-coated polyester
with tensile strength exceeding 5000 N/5 cm. The material resists
abrasion, puncture, and UV degradation, ensuring consistent
performance in seawater and hydraulic conditions.
Multi Point Lifting System
Each bag includes reinforced webbing harnesses with stainless steel
D-rings and shackles, providing secure load distribution. The
system allows controlled inflation and lifting, reducing torsion
and drift underwater.
Integrated Safety Valves and Inflation Ports
Hongruntong lift bags feature automatic over-pressure relief
valves, high-flow inflation ports, and one-way check valves
compatible with standard diving air systems. These features
guarantee operational safety and ease of maintenance.
Modular and Reusable Design
Each air lift bag is lightweight, foldable, and easy to transport.
Reusable up to 200 cycles, it supports both vertical and horizontal
lifting configurations, maximizing adaptability for complex salvage
operations.
Applications
Shipwreck and Vessel Recovery at Ports
Ideal for refloating fishing boats, tugboats, or barges that have
sunk in harbor areas or near docks.
Pipeline and Subsea Equipment Installation
Commonly used for buoyant support when installing or maintaining
underwater oil, gas, or communication lines.
Bridge and Port Construction Support
Provides controlled buoyancy for heavy prefabricated concrete or
steel components in bridge or port expansion projects.
Why Choose Hongruntong Marine
20+ Years of Marine Engineering Expertise
Hongruntong Marine has been a trusted partner in marine equipment
manufacturing, serving over 40 countries with ISO-certified
production facilities.
Custom Engineering OEM Capability
We provide fully customized air lift bags with adjustable buoyancy,
fabric type, and connection fittings to meet diverse project
requirements.
Global Support Network
Our professional service team offers 24/7 technical assistance,
spare parts supply, and on-site commissioning worldwide.
Proven Safety and Quality Control
Every lift bag undergoes hydrostatic testing and full inspection
before shipment, guaranteeing reliability and operational safety.
FAQ
1. What buoyancy range is available?
From 1 ton to 50 tons, with custom sizes available.
2. Can these lift bags be used in saltwater environments?
Yes, all materials are saltwater- and UV-resistant.
3. Do you provide repair kits?
Each unit includes a repair kit and valve maintenance tools.
4. Can we request OEM branding or custom printing?
Yes, logos and serial numbers can be customized.
5. What is the typical delivery time?
Usually 10–15 working days depending on quantity.
